If the weather's taken a turn for the worse, why not spend some time at Museu do Traje? You'll be fascinated by just how much you can discover about days gone by here.
To explore this collection of historical artifacts, head to Santa Maria Maior e Monserrate. You'll find loads of other things to see in the area, such as Sanctuary of Santa Luzia, Church of Santa Marta de Portuzelo, and Foreigners and Borders Service.